In rare cases, light can reflect of the inclusions to create a star effect or “asterism” which increases the value of the gemstone.Īt Israel Diamonds, we stock a wide range of loose sapphires, including spectacular Ceylon sapphires. As these inclusions are so common, a sapphire without inclusions would be suspected of being fake or treated. Most sapphires also contain minor inclusions, known as rutile needles or “silk” which decrease the transparency of the stone. Their color originates from trace amounts of iron and titanium. The Yogo sapphires, sourced from Yogo Gulch in Montana, USA are typically cornflower blue with high clarity and brilliance. Sapphires are dichroic stones, which means their color will vary when viewed from different angles, so a skilled gem cutter will make the most of the dominant color when choosing the cut for the stone. The most prized blue sapphires are velvety blue to violet blue in medium to medium dark tones, with vivid color saturation. Common secondary colors are green or purple. Other color variations of sapphire include yellow (or golden sapphire, if the color is particularly vibrant), pink sapphire, green sapphire, purple sapphire, orange sapphire, black sapphire and white sapphire.įor a sapphire to be called “blue”, the primary color of blue must account for at least 85% of the gemstone’s color. Not only is this an extraordinary size for a high quality natural sapphire, the cornflower blue color makes it particularly valuable. In November 2013, a 114.74 carat untreated cornflower blue Burmese sapphire sold for $7,223,285 at Sotheby’s Geneva. While the term “cornflower blue” is more descriptive than scientifically precise, it is extremely rare to find a sapphire of pure blue, so these are particularly prized. Sapphires generally have undertones of green or purple, while a cornflower blue sapphire is said to be closer to “true” blue, along with excellent tone and saturation to highlight the purity of the color. The cornflower is one of the few flowers that is purely blue, rather than violet or purple, so a cornflower blue sapphire is a gemstone with a color similar to the intense blue color of a cornflower.
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